Creating Geometry for Impellers in Stirring Vessels
 

I need to perform a 3D flow simulation of a Stirring Vessel similar to that explained in tutorial 17 of ANSYS CFX Tutorials.
My question (which is not adressed in that tutorial) is how do I make the geometry and meshing of the domain "impeller", since the impellers I have to study (optimization studies) do not have any standard shape.

Should I use:
1 - TurboGen,
2 - TurboEditor,
3 - Design Modeler (in which I think is very difficult to get a right domain "impeller")

Thank you for any support.